Climate feedbackAn interaction mechanism between processes in the climate system is called a climate feedback, when the result of an initial process triggers changes in a second process that in turn influences the initial one. A positive feedback intensifies the original process, and a negative feedback reduces it. IPCC

Global climate change science is all about feed-backs. In fact the large temperature swings fronm ice ages into warm periods like now is the result of +ve feed-backs- loss of ice sheet albedo cooling, increase methane and increase CO2. from planetary feedback sources (bottom of page)..

​​Climate change impacts is all about the many large positive amplifying feed-backs​​. The largest feed-backs are not accounted for in climate change assessments of the projected global temperature increases.

A positive (bad) amplifying happens when global warming causes an increase in the degree of warming (or acceleration of the rate of warming). ​​

It is the multiple large +ve Arctic feed-backs ​​that could cause abrupt warming and so called runaway climate change which would total planetary catastrophe for most life.

​The first +ve feedback ​is from water vapour which is a greenhouse ​gas.

The warmed atmosphere can hold more water vapor which increases the warming from the addition of a greenhouse gas alone. ​The water vapor increase about doubles the greenhouse gas warming. ​​